feat: remove ke from unicast undecl sub

src/net/primitives.c

@@ -237,7 +237,12 @@ int8_t _z_undeclare_subscriber(_z_subscriber_t *sub) {
         return _Z_ERR_ENTITY_UNKNOWN;
     }
     // Build the declare message to send on the wire
-    _z_declaration_t declaration = _z_make_undecl_subscriber(sub->_entity_id, &s->in->val._key);
+    _z_declaration_t declaration;
+    if (sub->_zn.in->val._tp._type == _Z_TRANSPORT_UNICAST_TYPE) {
+        declaration = _z_make_undecl_subscriber(sub->_entity_id, NULL);
+    } else {
+        declaration = _z_make_undecl_subscriber(sub->_entity_id, &s->in->val._key);
+    }
     _z_network_message_t n_msg = _z_n_msg_make_declare(declaration);
     if (_z_send_n_msg(&sub->_zn.in->val, &n_msg, Z_RELIABILITY_RELIABLE, Z_CONGESTION_CONTROL_BLOCK) != _Z_RES_OK) {
         return _Z_ERR_TRANSPORT_TX_FAILED;

src/protocol/definitions/declarations.c

@@ -76,10 +76,14 @@ _z_declaration_t _z_make_decl_subscriber(_Z_MOVE(_z_keyexpr_t) key, uint32_t id,
                                        ._keyexpr = _z_keyexpr_steal(key),
                                        ._ext_subinfo = {._pull_mode = pull_mode, ._reliable = reliable}}}};
 }
+
 _z_declaration_t _z_make_undecl_subscriber(uint32_t id, _Z_OPTIONAL const _z_keyexpr_t *key) {
-    return (_z_declaration_t){._tag = _Z_UNDECL_SUBSCRIBER,
-                              ._body = {._undecl_subscriber = {._id = id, ._ext_keyexpr = _z_keyexpr_duplicate(*key)}}};
+    return (_z_declaration_t){
+        ._tag = _Z_UNDECL_SUBSCRIBER,
+        ._body = {._undecl_subscriber = {
+                      ._id = id, ._ext_keyexpr = (key == NULL) ? _z_keyexpr_null() : _z_keyexpr_duplicate(*key)}}};
 }
+
 _z_declaration_t _z_make_decl_queryable(_Z_MOVE(_z_keyexpr_t) key, uint32_t id, uint32_t distance, uint8_t complete) {
     return (_z_declaration_t){
         ._tag = _Z_DECL_QUERYABLE,